Stair.



PATENTED AUG. 21, 1906.

S. GROSSMAN.

STAIR.

APPLICATION FILED FEB. 21. 1906.

KM l M 5 11 u 01 1 to z V I ll W o m SAMUEL GROSSMAN, or NEW YORK, N. Y.

STAIFI.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed February 21, 1906- Serial No. 302,262.

To all whom it may concern: 7

- Be it known that I, SAMUEL GROSSMAN, a citizen of the United States,residing in the borough of Manhattan, county and State of New York, haveinvented certain new and useful Improvements in Stairs, of which thefollowing is such a full, clear, and exact description as will enableany one skilled in the art to which it apertains to make and use thesame, reference eing had to the accompanying drawings, forming part ofthis specification.

he principal ob'ects of my invention are to provide stairs which whilehaving greater strength than similar .structures of equal weight arefireproof, at the same time are neater in appearance and simple inconstruction, the various parts thereof being easily assembled andsecured together in erecting the stairs in place.

The invention also seeks to utilize to the best advantages light-Wei htsheet metal and angle-irons and to provi e a fireproof structure theweight of which may be materially reduced by the omission of the usualsheetmetal tread beneath the stone tread.

With these and other objects in view my invention consists in thevarious novel and peculiar arrangements and combinations ofthe severalparts of the structure, all as here inafter fully described and thenpointed out in the claims.

I have illustrated a type of my invention the accompanying drawings,wherein- Figure l is a perspective view of my improved construction instairs, the u per ste 3 thereof being shown as complete inclu ing thetreads, while the lower steps are only partially constructed. tical theriser omitted. Fig. 3 shows a metallic blank with a notch in its edgefrom which the continuous angle-iron is formed for supporting therisers. Fig. 4 is a sectional view taken on a vertical plane lengthwisethe stairs with the stringer omitted and showin the relative ositions ofthe angle-iron, tread and riser. ig. 5 is a cross-sectional view ofanother form of riser in which the flanges thereof are bent in oppositedirections.

Referring to the drawings, in which like numbers 0 reference desi natelike parts throughout, 1 indicates a side wall against which the stairsare constructed and in which is set, flush with the face of the wall,the innor stringer 2, which is made of thin sheet New York city,

Fig. 2 is a ver-- cross-sectional view of one step with metal and hasits up er and lower edges formed with an integra flan e 3, projectininwardly, so as to be embed ed in the wal The outer stringer 4isconstructed like the inner one, with the inte ral flan es 5 at the,

upper and lower edges t ereof, w ich flanges project inwardly, thestringers being formed near each flange with strengthening andornamental corrugations or bends 6, extending longitudinally of thestrin er. The edges of this stringer are thus ma e hollow, at the sametime appear solid from the.outside thereof. T liis integral molding 6 onthe face of the outer stringer may be varied in shape or design to suitthe taste. These stringers, as stated, are made in one piece withtheflan es, and the formation of these longitudinal flanges orcorrugations 6 on the stringers serve to materially strengthen the sameand ermits of a substantial reduction in the thickness of the metalused. For example, by making the sheet-metal stringers as herein setforth I am enabled to use sheetiron of one-sixteenth of an inch thick,and thereby materially lighten the weight of the structure, thecorresponding stringers heretof ore made of sheet metalrangingfromthreesixteenths to one-quarter of an inch in thicknose.

The side or end supports for the risers are formed from angle irons 7,which are notched at 8 and cut at 9, so that they may be bent into azigzag structure with right-angle bends, forming a continuous pieceextending the length of the stairs. These angle-irons are formed so thatone of the flanges thereof lies flatly against the inner face of itsadjacent stringer, one angle-iron being secured to each stringer. Theother flange of each angleiron hes uppermost and outermost when lookingtoward the front of the stairs, as shown clearly in Fig. 1. As thesesupporting angle-irons can be bent exact alike, they may easily be putin place, one against each 0 the stringers, to which they are secured bymeans of suitable rivets 10 extendin through the vertical flange andinto the flody of the adjacent stringer, so as to give ample stren ththereto, at the same time dispensin with bolt-heads showing upon theoutsh e of the stringer.

The risers 11 are made of sheet-metal and are each formed with a lateralflange 12 at its up er and lower ed 7 e extending throughout t e lengththereo which flan es may either both project forwardly, as s can in Fig.1-, or the lower one may extend forin proper position thereon, and therises and wardly while the upper one pro'ects reartreads may be takenseparately to the buildwardly, as shown in Fig. 5, w erein the ing orplace where it is desired to erect the flanges 12 are shown as proecting in o postairs, and these simple parts may be assem- 5 sitedirections. The risers 11, being ma e of bled and placed into correctposition without 70 sheet metal and provided with the integral requirinany special work to be done at such flanges 12 on the long edgesthereof, are therepllace. y improved construction in stairs by givenincreased strength, so that the risers as the advantage of iving abetter appearmay be made of thinner iron than has been ance to stairswhic are constructed of heretofore used in the construction of similarmetal, and, moreover, it possesses the im- 75 stairs, and thus I providestairs which are ortant advantageof havinggreater strength materiallylightene in weight in the risers or a given weight than otherstructures, and

themselves, and I am enabled to use iron they may be made com letelyfireproof. As one-sixteenth of an inch thick in this part of there areno bolt-headss owingupon the out- 15 the structure. Further strength isgiven to side of the strin ers and the steps themselves 80 thesheet-metal risers by forming each with present a very nished and neatappearance, ,corrugations or paneling, as at 13, which also thestructure may be painted to resemble serves to ornament the riser inaddition to hard wood with excellent effect. giving it increasedstrength. It willbe noted Having thus described my invention, what thatthese panels 13, formed in the body of I claim, and desire to secure byLetters Pat- 85 the sheet-metal risers, may be made of any ent, is shapeor design that may be desired so that 1. Stairs comprising thecombination of the ornamental feature of such anel may be suitablestringers, supports located upon the varied. At the same time t ieincreased inner side of said stringers, treads, and indez 5 strength ofsuch panel is alwa s resent. pendent sheet-metal risers secured to saidgo The users are bolted, by means o be ts 14 at sup orts and providedwith integral flanges each end, to the vertical flange of the angleat te upper and lower ed es thereof for eniron 7, and the lower flangereceives the rear gagin said treads resting t hereupon. edge of thetread 15, while the upper flange of 2. tairs comprisin the combinationof c the riser receives the forward edge of the sheet-metal strin ersaving longitudinally 5 tread 15 next above, and thus the risers suextending strengt ening ribs or corrugations port the treads by means ofthe flanges. 11 formed therein, supports located upon the inthisconnection it is observed that in using ner side of said stringers,treads, and indestone treads, such as slate or marble, I can pendentsheet-metal risers secured to said 3 5 dispense with the ordinarysheet-metal sup orts and provided with integral flanges loo treadunderneath the stone one in some cases, at the upper and lower edgesthereof for enthough where fireproof stairs are desired a gagin saidtreads. sheet tread may be placed under the stone 3. tairs comprisin thecombination of one, it being so arranged as to rest upon the sheet-metalstrin ers aving longitudinally- 4o riser-flanges. In cases where eachriser has extendin strengtiiening ribs or corrugations 105 its upper andlower flange projecting in opformed t erein, suitably-bent angle-ironsfor osite directions, as shown in Fig. 5, such supporting the treads andrisers at each end I anges would both extend over upon the thereof andsecured by one flange to the inner horizontal part of the angle-irons,so that the side of the adjacent stringer, treads resting 5 tread wouldrest at its ont edge upon the on the said angle-iron supports," andrisers no rearwardly-extending flan e of one user and secured at theirends to said angle-iron supat its rear ed fe upon theorwardly-extendports, respectively. ing flange of t e next riser above,and in such 4. Stairs comprisin the combination of case a suitablefilling-piece may be inserted sheet-metal strin. ers avinglongitudinallybetween the opposing edges of the flanges extendingstrengt ening ribs or corrugations 115 and beneath the tread to relievethe latter of formed therein, supports located upon the inan% unduestress. ner side of said stringers, treads, and sheethe treads 15 areeach rabbeted at 16, at metal risers secured to said supports and protheback edge thereof, to fit over the lower vided with integral flanges atthe upper and flange 12 of the riser at the rear of the tread. loweredges thereof for enga ing said treads, 1 20 In the modification,however, shown in Fig. the said risers being forme with strength- 5,where the u per flange of the riser is ening-ribs or paneling thereon.turned backwar ly, the flange may be placed 5. Stairs comprisin thecombination of over upon the horizontal art of the anglesheet-metalstrin ers aving longitudinallyiron and be on a level wit the lowerflange extending strengt ening ribs or corrugations 12: of the risernext above, and these two flanges formed therein, treads, supportslocated upon will be in the same horizontal plane, so that the innerside of said stringers and receiving the tread may rest directly uponthem withthe respective ends of said treads, and inde out cutting awayany art thereof. pendent sheet-metal risers secured tov said TheStringers,witht c angle-ironsfastened supports and provided withintegral flanges r at the upper and lower edges thereof for ensaidtreads. V

6. teirs comprising the combination of suitable stringers, supportslocated upon the 4 5 inner sides of said stringers independentsheet-metal risers secured at their respective ends to said supports onthe stringers, said risers being provided at their lower edges withflanges, and trends each resting upon the upper edge of one riser endthe flange at 10 the lower edge of the riser next above.

In testimony whereof I have hereunto set my hand in the presence of thetwo subscrib-

